The userspace command line program of netfilter for packets filtering
A complete implementation of the OpenPGP to encrypt and sign
A portable foreign function interface library
Light-weight cryptographic and SSL/TLS library
A utility for getting files from remote servers (FTP, HTTP, and others)
Advanced IP routing and network device configuration tools
The free peer-reviewed portable C++ source libraries
Extended crypt library for descrypt, md5crypt, bcrypt, and others
Collection of basic system utilities